Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quem eram os oponentes da equipe visitante de Carlton?
 ###Tabelas: CREATE TABLE doubles_finals_10_6-4 (doubles_finals_10_6-4_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date INT, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE current_members_of_the_baltimore_city_delegation (current_members_of_the_baltimore_city_delegation_id AUTO_INCREMENT PRIMARY KEY, District INT, Place of Birth VARCHAR, Delegate VARCHAR, Party VARCHAR, Took Office INT, Committee VARCHAR) CREATE TABLE 1990s-_persian_gulf_war_and_no-fly_zones (1990s-_persian_gulf_war_and_no-fly_zones_id AUTO_INCREMENT PRIMARY KEY, Aircraft VARCHAR, 1990 INT, destroyed INT, damaged INT, to Iran INT, survived INT) CREATE TABLE h (h_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Nationality VARCHAR, Position VARCHAR, Years for Jazz VARCHAR, School/Club Team VARCHAR) CREATE TABLE round_2 (round_2_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Venue VARCHAR, Crowd INT, Date VARCHAR)  
SELECT Away team FROM round_2 WHERE Home team = carlton